1/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
2 * All rights reserved.
3 *
4 * This package is an SSL implementation written
5 * by Eric Young (eay@cryptsoft.com).
6 * The implementation was written so as to conform with Netscapes SSL.
7 *
8 * This library is free for commercial and non-commercial use as long as
9 * the following conditions are aheared to. The following conditions
10 * apply to all code found in this distribution, be it the RC4, RSA,
11 * lhash, DES, etc., code; not just the SSL code. The SSL documentation
12 * included with this distribution is covered by the same copyright terms
13 * except that the holder is Tim Hudson (tjh@cryptsoft.com).
14 *
15 * Copyright remains Eric Young's, and as such any Copyright notices in
16 * the code are not to be removed.
17 * If this package is used in a product, Eric Young should be given attribution
18 * as the author of the parts of the library used.
19 * This can be in the form of a textual message at program startup or
20 * in documentation (online or textual) provided with the package.
21 *
22 * Redistribution and use in source and binary forms, with or without
23 * modification, are permitted provided that the following conditions
24 * are met:
25 * 1. Redistributions of source code must retain the copyright
26 * notice, this list of conditions and the following disclaimer.
27 * 2. Redistributions in binary form must reproduce the above copyright
28 * notice, this list of conditions and the following disclaimer in the
29 * documentation and/or other materials provided with the distribution.
30 * 3. All advertising materials mentioning features or use of this software
31 * must display the following acknowledgement:
32 * "This product includes cryptographic software written by
33 * Eric Young (eay@cryptsoft.com)"
34 * The word 'cryptographic' can be left out if the rouines from the library
35 * being used are not cryptographic related :-).
36 * 4. If you include any Windows specific code (or a derivative thereof) from
37 * the apps directory (application code) you must include an acknowledgement:
38 * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
39 *
40 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
41 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
42 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
43 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
44 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
45 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
46 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
47 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
48 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
49 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
50 * SUCH DAMAGE.
51 *
52 * The licence and distribution terms for any publically available version or
53 * derivative of this code cannot be changed. i.e. this code cannot simply be
54 * copied and put under another distribution licence
55 * [including the GNU Public Licence.] */
56
57#include <openssl/digest.h>
58
59#include <assert.h>
60#include <string.h>
61
62#include <openssl/err.h>
63#include <openssl/mem.h>
64
65#include "internal.h"
66#include "../../internal.h"
67
68
69int EVP_MD_type(const EVP_MD *md) { return md->type; }
70
71int EVP_MD_nid(const EVP_MD *md) { return EVP_MD_type(md); }
72
73uint32_t EVP_MD_flags(const EVP_MD *md) { return md->flags; }
74
75size_t EVP_MD_size(const EVP_MD *md) { return md->md_size; }
76
77size_t EVP_MD_block_size(const EVP_MD *md) { return md->block_size; }
78
79
80void EVP_MD_CTX_init(EVP_MD_CTX *ctx) {
81 OPENSSL_memset(dst: ctx, c: 0, n: sizeof(EVP_MD_CTX));
82}
83
84EVP_MD_CTX *EVP_MD_CTX_new(void) {
85 EVP_MD_CTX *ctx = OPENSSL_malloc(size: sizeof(EVP_MD_CTX));
86
87 if (ctx) {
88 EVP_MD_CTX_init(ctx);
89 }
90
91 return ctx;
92}
93
94EVP_MD_CTX *EVP_MD_CTX_create(void) { return EVP_MD_CTX_new(); }
95
96int EVP_MD_CTX_cleanup(EVP_MD_CTX *ctx) {
97 OPENSSL_free(ptr: ctx->md_data);
98
99 assert(ctx->pctx == NULL || ctx->pctx_ops != NULL);
100 if (ctx->pctx_ops) {
101 ctx->pctx_ops->free(ctx->pctx);
102 }
103
104 EVP_MD_CTX_init(ctx);
105
106 return 1;
107}
108
109void EVP_MD_CTX_cleanse(EVP_MD_CTX *ctx) {
110 OPENSSL_cleanse(ptr: ctx->md_data, len: ctx->digest->ctx_size);
111 EVP_MD_CTX_cleanup(ctx);
112}
113
114void EVP_MD_CTX_free(EVP_MD_CTX *ctx) {
115 if (!ctx) {
116 return;
117 }
118
119 EVP_MD_CTX_cleanup(ctx);
120 OPENSSL_free(ptr: ctx);
121}
122
123void EVP_MD_CTX_destroy(EVP_MD_CTX *ctx) { EVP_MD_CTX_free(ctx); }
124
125int EVP_DigestFinalXOF(EVP_MD_CTX *ctx, uint8_t *out, size_t len) {
126 OPENSSL_PUT_ERROR(DIGEST, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
127 return 0;
128}
129
130uint32_t EVP_MD_meth_get_flags(const EVP_MD *md) { return EVP_MD_flags(md); }
131
132void EVP_MD_CTX_set_flags(EVP_MD_CTX *ctx, int flags) {}
133
134int EVP_MD_CTX_copy_ex(EVP_MD_CTX *out, const EVP_MD_CTX *in) {
135 // |in->digest| may be NULL if this is a signing |EVP_MD_CTX| for, e.g.,
136 // Ed25519 which does not hash with |EVP_MD_CTX|.
137 if (in == NULL || (in->pctx == NULL && in->digest == NULL)) {
138 OPENSSL_PUT_ERROR(DIGEST, DIGEST_R_INPUT_NOT_INITIALIZED);
139 return 0;
140 }
141
142 EVP_PKEY_CTX *pctx = NULL;
143 assert(in->pctx == NULL || in->pctx_ops != NULL);
144 if (in->pctx) {
145 pctx = in->pctx_ops->dup(in->pctx);
146 if (!pctx) {
147 return 0;
148 }
149 }
150
151 uint8_t *tmp_buf = NULL;
152 if (in->digest != NULL) {
153 if (out->digest != in->digest) {
154 assert(in->digest->ctx_size != 0);
155 tmp_buf = OPENSSL_malloc(size: in->digest->ctx_size);
156 if (tmp_buf == NULL) {
157 if (pctx) {
158 in->pctx_ops->free(pctx);
159 }
160 return 0;
161 }
162 } else {
163 // |md_data| will be the correct size in this case. It's removed from
164 // |out| so that |EVP_MD_CTX_cleanup| doesn't free it, and then it's
165 // reused.
166 tmp_buf = out->md_data;
167 out->md_data = NULL;
168 }
169 }
170
171 EVP_MD_CTX_cleanup(ctx: out);
172
173 out->digest = in->digest;
174 out->md_data = tmp_buf;
175 if (in->digest != NULL) {
176 OPENSSL_memcpy(dst: out->md_data, src: in->md_data, n: in->digest->ctx_size);
177 }
178 out->pctx = pctx;
179 out->pctx_ops = in->pctx_ops;
180 assert(out->pctx == NULL || out->pctx_ops != NULL);
181
182 return 1;
183}
184
185void EVP_MD_CTX_move(EVP_MD_CTX *out, EVP_MD_CTX *in) {
186 EVP_MD_CTX_cleanup(ctx: out);
187 // While not guaranteed, |EVP_MD_CTX| is currently safe to move with |memcpy|.
188 OPENSSL_memcpy(dst: out, src: in, n: sizeof(EVP_MD_CTX));
189 EVP_MD_CTX_init(ctx: in);
190}
191
192int EVP_MD_CTX_copy(EVP_MD_CTX *out, const EVP_MD_CTX *in) {
193 EVP_MD_CTX_init(ctx: out);
194 return EVP_MD_CTX_copy_ex(out, in);
195}
196
197int EVP_MD_CTX_reset(EVP_MD_CTX *ctx) {
198 EVP_MD_CTX_cleanup(ctx);
199 EVP_MD_CTX_init(ctx);
200 return 1;
201}
202
203int EVP_DigestInit_ex(EVP_MD_CTX *ctx, const EVP_MD *type, ENGINE *engine) {
204 if (ctx->digest != type) {
205 assert(type->ctx_size != 0);
206 uint8_t *md_data = OPENSSL_malloc(size: type->ctx_size);
207 if (md_data == NULL) {
208 return 0;
209 }
210
211 OPENSSL_free(ptr: ctx->md_data);
212 ctx->md_data = md_data;
213 ctx->digest = type;
214 }
215
216 assert(ctx->pctx == NULL || ctx->pctx_ops != NULL);
217
218 ctx->digest->init(ctx);
219 return 1;
220}
221
222int EVP_DigestInit(EVP_MD_CTX *ctx, const EVP_MD *type) {
223 EVP_MD_CTX_init(ctx);
224 return EVP_DigestInit_ex(ctx, type, NULL);
225}
226
227int EVP_DigestUpdate(EVP_MD_CTX *ctx, const void *data, size_t len) {
228 ctx->digest->update(ctx, data, len);
229 return 1;
230}
231
232int EVP_DigestFinal_ex(EVP_MD_CTX *ctx, uint8_t *md_out, unsigned int *size) {
233 assert(ctx->digest->md_size <= EVP_MAX_MD_SIZE);
234 ctx->digest->final(ctx, md_out);
235 if (size != NULL) {
236 *size = ctx->digest->md_size;
237 }
238 OPENSSL_cleanse(ptr: ctx->md_data, len: ctx->digest->ctx_size);
239 return 1;
240}
241
242int EVP_DigestFinal(EVP_MD_CTX *ctx, uint8_t *md, unsigned int *size) {
243 (void)EVP_DigestFinal_ex(ctx, md_out: md, size);
244 EVP_MD_CTX_cleanup(ctx);
245 return 1;
246}
247
248int EVP_Digest(const void *data, size_t count, uint8_t *out_md,
249 unsigned int *out_size, const EVP_MD *type, ENGINE *impl) {
250 EVP_MD_CTX ctx;
251 int ret;
252
253 EVP_MD_CTX_init(ctx: &ctx);
254 ret = EVP_DigestInit_ex(ctx: &ctx, type, engine: impl) &&
255 EVP_DigestUpdate(ctx: &ctx, data, len: count) &&
256 EVP_DigestFinal_ex(ctx: &ctx, md_out: out_md, size: out_size);
257 EVP_MD_CTX_cleanup(ctx: &ctx);
258
259 return ret;
260}
261
262
263const EVP_MD *EVP_MD_CTX_md(const EVP_MD_CTX *ctx) {
264 if (ctx == NULL) {
265 return NULL;
266 }
267 return ctx->digest;
268}
269
270size_t EVP_MD_CTX_size(const EVP_MD_CTX *ctx) {
271 return EVP_MD_size(md: EVP_MD_CTX_md(ctx));
272}
273
274size_t EVP_MD_CTX_block_size(const EVP_MD_CTX *ctx) {
275 return EVP_MD_block_size(md: EVP_MD_CTX_md(ctx));
276}
277
278int EVP_MD_CTX_type(const EVP_MD_CTX *ctx) {
279 return EVP_MD_type(md: EVP_MD_CTX_md(ctx));
280}
281
282int EVP_add_digest(const EVP_MD *digest) {
283 return 1;
284}
285

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